Pin holding device



Feb. 9, 1937. J. SUNNEN 2,070,380,

PIN HOLDING DEVICE Filed Aug. 15, 1954 Patented Feb. 9, 1937 UNITEDstares PATENT OFFICE 2 Claims.

My invention has relation to improvements in pin holding devices and itconsists in the novel features of construction more fully set forth inthe specication and pointed out in the claims.

The invention is more particularly directed to devices for holding pinsthat are being accurately fitted to an opening in a machine, and it isprimarily adapted for the purpose of holding piston pins in order to ritthem into the piston bosses, the holes in which have been newly reamedor ground. The closeness with which piston pins are fitted into theopenings in the bosses makes it difficult to fit the same by holding thepin in the hand; and on the other hand if the pin is clamped in anordinary vise while performing the fitting operation there is liabilityof the vise pressure pressing the pin (which is generally hollow) out ofround.

I have, therefore, devised a pin holding device which has for itsprincipal objects the holding of the pin by clamping the wall thereof soas not to exert pressure diametrically across the pin, and the holdingof the pin firmly without the application of excessive pressure thereto.A further object of the invention is to provide a pin holding devicethat is simple and durable and operates on the principle oi a clamp, thecooperating members of which are self-adjusting so that they willproperly engage the p-in as soon as pressure is applied thereto withoutthe necessity of carefully fitting said members to the pin.

Further and other advantages will be better apparent from a detaileddescription of the invention in connection with the accompanyingdrawing, in which:

Figure 1 is a top plan of my novel pin holder holding a piston pin, partof the pin holder being broken away; Fig. 2 is a side elevation of thepin holder and pin held thereby; Fig. 3 is an enlarged verticallongitudinal section taken on the line S-S of Fig. l; Fig. 4 is a rearelevation of the pin holder with part of the clamping screw broken away;and Fig. 5 is a vertical cross-section taken on the line 5-5 of Fig. 3.

Referring to the drawing, I represents a base member (preferably of castiron), at the front end of which is erected a pedestal 2, and in therear end a flange 3, between which there are longitudinally extendingribs 4, 4. An opening '5 extends through the bottom of the base member Ibetween the ribs 4, i to receive a bolt 6 whereby the base member may befastened to a table or bench, not shown. The pedestal 2 is provided witha longitudinally extending bore 1 inclining slightly upwardly to thefront face 8 of the base member I, and a pin 9 is driven into the bore1, said pin projecting somewhat beyond the face 8 and having itsextending portionslightly flattened at the top, as shown by the planesurface I0. A threaded stud II is 5 fixed in the threaded socket I2 inthe pedestal 2, said stud projecting a substantial distance above thepedestal. A hollow cap I3 is positioned over flange 3 and pedestal 2 ofthe base member I, the top wall I4 of said cap having an 10 opening I5through which the stud II passes. The cap I3 is held in assembledrelation with the base I by means of a nut I6, the lower rounded end Ilof which enters the countersunk washer I8 disposed between the nut andthe 15 top wall I4 of the cap. The upper part of the nut I6 is traversedby the handle part I9 to facilitate the rotation of the nut.

The front wall of the cap I3 is provided with an extension 2l adjacentto the bottom edge of 2O said wall 20 for the purpose of lengthening thesurface 22 in which is formed a concavity 23 (in the present instancemore nearly V-shaped) which serves as a seat for the piston pin when thelatter is held by the holding device, as will now 25 be explained.

In the drawing, a piston pin P is shown clamped between the base memberI and cap I3. Obviously, the nut I6 had to be unloosened to allow thecap I3 and base I to be separated suf- 30 ciently in order that thespace between the concave seat 23 and projecting end of pin 9 wouldreceive said pin. The operator inserts the pin P in said space and makessure that the end of the pin P is in abutting relation with the frontface 8 of the base member. The nut I is then turned so as to bring thecap I3 and base I together, thus causing the wall of the piston pin tobe clamped between the projecting end of the pin 9 and seat 23 of thecap I3. It 40 will be observed that the provision of the flat face I0 onthe pin 9 produces opposite corners a, a at the extremity o-f the pin Swhich allow contact with the inner surface of the piston pin P and forcethe same to bear from one end to the other of the concave seat 23. Thelength of the projecting end of the pin 9 is such that these corners a,a will come opposite the approximate center of the concave seat 23. Thispoint of application of the clamping force insures that the piston pin Pwill be iirmly held against the seat 23 so that there will be nopossibility of the piston pin teetering when the piston is applied to itfor the purpose of testing the size of the piston pin holes. Theinclination of the pin 9 55 so that only its outer extremity willContact with the bore of the piston pin P insures that the pin will bermly clamped no matter what the shape of this bore may be.

Having described my invention, I claim:

1. A device of the character described comprising a base member and acap member movably mounted thereon, one of said members having a concavesurface overhanging the other member, the other member having aprojecting element below and inclining toward said concave surface, saidelement terminating within the margins of said surface, and means formoving the base member and the cap member together to clamp the workpiece between them.

2. A device of the character described comprising a base member having apedestal erected at one end, a stud projecting upwardly from saidpedestal, a pin projecting laterally from the pedestal, a hollow capmovably mounted over said pedestal and perforated to receive said stud,said cap having a concave surface in juxtaposition with the pin to holdthe work against said pin, and a nut operable over the stud to clampsaid base member and cap together.

JOSEPH SUNNEN.

